John  w



(NoMo d eLy I I J. W; BALDWIN. APPARATUS FOR DISTRIBUTING BRONZE OR OTHER POWDERS. No. 851,483. Patented Oct; 26, 86.

UNITED STATES PATENT OFFICE.

JOHN W. BALDWIN, OF BOSTON, MASSACHUSETTS, ASSIGNOB TO GEORGE A. FULLERTON, OF SAME PLACE.

APPARATUS FOR DISTRIBUTING BRONZE OR OTHER POWDER S.

SPECIFICATION forming part of Letters Patent No. 351,483, dated October 26, 1886 Application filed May 19, 1886. Serial No. 202,698. (No model.)

' Powders, of which the following is aspecification, reference being had to the accompanying drawings, making a part hereof, in which- Figure 1 is an end elevation of a hopper and its trough supplied with one form of my apparatus. Fig. 2 is a section online 2 2 of Fig. 3. Fig. 3 is a partial front elevation. Fig. 4 is an end view showing the end opposite that shown in Fig. 1.

In the practical manufacture of certain goods it is necessary that powdered substances be dusted on them, and the object of my invention is to effect this with economyand with regularity. One grave defect in all other methods of distributing powders is that the amount discharged varies so much that there is sometimes a waste, and sometimes less than is desired is discharged, the result being not only a waste of the powder when too much is discharged, but a damage to the goods, the goods being injured more or less, either by too much or too little.

My invention consists in the combination of a hopper with a roll having grooves in its surface, and of a strip against which the roll runs, so that the roll takes from its hopper for distribution a fixed quantity of powder, depending on the capacity of its grooves.

In the drawings, the hopper Ais provided with a distributingroll, B, which is mounted on a shaft, 1), and so arranged that when rotated its surface bears against striker D, which is preferably made of a sheet of leatheroid,

though other material may be used for it.

Shaft b may be made hollow, for the admission of steam, in a well-known way, when it is desirable to have the roll heated for certain powders. Striker D is backed up with a strip, d, of rubber and a metal plate, 01, and is made adjustable in respect of the distributingroll B by means of screwsd The surface of roll B is threaded or otherwise recessed to retain a desired quantity of the powder, which is pressed into the recesses of the rollwhen the roll rotates against the striker D. Various ways may be devised for discharging the powder from the recesses in the roll after the roll passes the striker, th ongh' in some cases, when dry powders are used, the roll will discharge itself; but I have found it best to use the rotary brush F, preferably of card-clothing, and so arranged as to convey the powder from the roll upon the goods underneath. Brush F is mounted on a shaft, f, journaled in brackets, which are slotted and provided with clamping-screws, so that shaft f is adjustable away from and toward the roll B, as will be readily understood. Shafts b and f are adapted to be driven simultaneously by meansshown, but too well known to require description. To prevent the powder from sifting down upon the brush, I slant one side of the hopper toward the axis of roll B, with its lower edge just grazing the roll; and

as it is often convenient to have one side of the hopper removable, I make the hopper A with the side a removable, and provide the slide a, moving in the grooves a which are sufficiently long to let the slide pass by the striker D, to keep the powder from falling out.

The practical advantages of my machine are that the roll B takes up a regular quantity of powder, according to the capacity of its re cesses, and no more, and that the stock fed over the trough A underneath is evenly dusted, without waste of powder.

I am aware of the patents of Battermann (No.

1. The combination of hopper A with striker I D and roll B, whose periphery is recessed, substantially as and'for the purpose set forth.

'2. In combination, the hopper A, the distributing-roll B, the striker D, and cleaningbrush F, substantially as described.

JOHN W. BALDWIN.

Witnesses:

EDWARD S. BEACH, JOHN R. SNow. 

